nodejs+express文件操作实现小型学生管理系统（增删改查）-纯享版

实现文件数据更新功能

用来放置一些不希望被用户看见，但是需要被提交到服务端的数据

因为读取的文件信息，然后他的类型是字符串，切记

…………………………
  student.id = parseInt(student.id);
  var stu = students.find(function (item) {
      return item.id === student.id
  })

app.js

var express = require('express');
var path = require('path');
var router = require(path.join(__dirname, './router'));
// 引包
var bodyParser = require('body-parser');

var server = express();

server.engine('html', require('express-art-template'));
server.set('views', path.join(__dirname, 'views'));

server.use('/node_modules/', express.static(path.join(__dirname, './node_modules/')));
server.use('/public/', express.static(path.join(__dirname, './public/')));


server.use(bodyParser.urlencoded({ extended: false }))
    .use(bodyParser.json())


server.use(router);

server.listen(3000, function () {
    console.log('Run Server 3000……');
})

router.js

// 路由模块设计集合

var fs = require('fs');
var path = require('path');
var Student = require('./student');

var express = require('express');

var router = express.Router();

router.get('/students', function (req,) {
  
    Student.find(function (err,) {
        if (err) {
            return res.status(500).send('Server error.');
        }
        res.render('index.html', {
            students: students
        });
    })
})
router.get('/students/new', function (req,) {
    res.render('new.html');
})
router.post('/students/new', function (req,) {
   
    var student = req.body;
    Student.save(student, function (err) {
        if (err) {
            return res.status(500).send('Server error.');
        }
        res.redirect('/students');
    })

})
router.get('/students/edit', function (req,) {
   
    Student.findId(parseInt(req.query.id), function (err,) {
        if (err) {
            return res.status(500).send('Server error.');
        }
        
        res.render('edit.html', {
            student: student
        })
    })

})
router.post('/students/edit', function (req,) {

    Student.updataByid(req.body, function (err) {
        if (err) {
            return res.status(500).send('Server error.');
        }
    })
    res.redirect('/students')
})
router.get('/students/delete', function (req,) {
  
    Student.deleteByid(req.query.id, function (err) {
        if (err) {
            return res.status(500).send('Server error.');
        }
        res.redirect('/students')
    })
})


module.exports = router;

student.js

var fs = require('fs');
var path = require('path');
var dbPath = './db.json';

exports.find = function (callback) {
    fs.readFile(path.join(__dirname, dbPath), 'utf8', function (err,) {
        if (err) {
            return callback(err)
        }
        callback(null, JSON.parse(data).student)
      
    })
}

exports.save = function (Nstudent,) {
    fs.readFile(path.join(__dirname, dbPath), 'utf8', function (err,) {
        if (err) {
            return callback(err)
        }
        var students = JSON.parse(data).student;

        Nstudent.id = students[students.length - 1].id + 1;

        students.push(Nstudent);

        var fileData = JSON.stringify({
            student: students
        })
        fs.writeFile(path.join(__dirname, dbPath), fileData, function (err) {
            if (err) {
                return callback(err)
            }
            callback(null);

        });
    })
}

exports.updataByid = function (student,) {
    fs.readFile(path.join(__dirname, dbPath), 'utf8', function (err,) {
        if (err) {
            return callback(err)
        }
        var students = JSON.parse(data).student;
 
        student.id = parseInt(student.id);

        var stu = students.find(function (item) {
            return item.id === student.id
        })

        for (var key in student) {
            stu[key] = student[key];
        }
        var fileData = JSON.stringify({
            student: students
        })
        fs.writeFile(path.join(__dirname, dbPath), fileData, function (err) {
            if (err) {
                return callback(err)
            }
            callback(null);
        })

    })
}
exports.findId = function (id,) {
    fs.readFile(path.join(__dirname, dbPath), 'utf8', function (err,) {
        if (err) {
            return callback(err)
        }
        var students = JSON.parse(data).student;
        var ret = students.find(function (item) {
            return item.id === parseInt(id)
        })
        callback(null, ret);
    })
}
exports.deleteByid = function (id,) {
    fs.readFile(path.join(__dirname, dbPath), 'utf8', function (err,) {
        if (err) {
            return callback(err)
        }
        var students = JSON.parse(data).student;
      
        var deleteID = students.findIndex(function (item) {
            return item.id === parseInt(id);
        })
       
        students.splice(deleteID, 1);
       
        var fileData = JSON.stringify({
            student: students
        })
      
        fs.writeFile(path.join(__dirname, dbPath), fileData, function (err) {
            if (err) {
                return callback(err)
            }
            callback(null);
        })

    })
}